GARP VLAN Registration Protocol (GVRP) | 359Based on the configuration in the example shown in Figure 17-5, the interface 1/21 will not be removedfrom VLAN 34 or VLAN 35 despite receiving a GVRP Leave message. Additionally, the interface will notbe dynamically added to VLAN 45 or VLAN 46, even if a GVRP Join message is received.Figure 17-5. Configuring GVRP RegistrationConfiguring a GARP TimerGARP timers must be set to the same values on all devices that are exchanging information using GVRP:• Join: A GARP device reliably transmits Join messages to other devices by sending each Join messagetwo times. Use this parameter to define the interval between the two sending operations of each Joinmessage. The FTOS default is 200ms.• Leave: When a GARP device expects to de-register a piece of attribute information, it will send out aLeave message and start this timer. If a Join message does not arrive before the timer expires, theinformation is de-registered. The Leave timer must be greater than or equal to 3x the Join timer. TheFTOS default is 600ms.• LeaveAll: Upon startup, a GARP device globally starts a LeaveAll timer. Upon expiration of thisinterval, it will send out a LeaveAll message so that other GARP devices can re-register all relevantattribute information. The device then restarts the LeaveAll timer to begin a new cycle. The LeaveAlltimer must be greater than or equal to 5x of the Leave timer. The FTOS default is 10000ms.Figure 17-6. Configuring GVRP RegistrationFTOS(conf-if-gi-1/21)#gvrp registration fixed 34,35FTOS(conf-if-gi-1/21)#gvrp registration forbidden 45,46FTOS(conf-if-gi-1/21)#show conf!interface GigabitEthernet 1/21no ip addressswitchportgvrp enablegvrp registration fixed 34-35gvrp registration forbidden 45-46no shutdownFTOS(conf-if-gi-1/21)#FTOS(conf)#garp timer leav 1000FTOS(conf)#garp timers leave-all 5000FTOS(conf)#garp timer join 300Verification:FTOS(conf)#do show garp timerGARP Timers Value (milliseconds)----------------------------------------Join Timer 300Leave Timer 1000LeaveAll Timer 5000FTOS(conf)#
